CN111293996A - Balanced amplifier and power amplification method of radio frequency signal - Google Patents
Balanced amplifier and power amplification method of radio frequency signal Download PDFInfo
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- CN111293996A CN111293996A CN202010147238.2A CN202010147238A CN111293996A CN 111293996 A CN111293996 A CN 111293996A CN 202010147238 A CN202010147238 A CN 202010147238A CN 111293996 A CN111293996 A CN 111293996A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/189—High frequency amplifiers, e.g. radio frequency amplifiers
Abstract
A balanced amplifier includes an input switch, wherein at least one radio frequency signal is coupled to the input switch; a first and a second branch, said first and second branch being connected to said input switch respectively and being configured to amplify one of said at least one radio frequency signal respectively; and the output switch is respectively connected with the first branch and the second branch and respectively outputs the amplified at least one radio frequency signal to at least one radio frequency antenna. The application also discloses a power amplification method of the radio frequency signal, which comprises the steps of inputting at least one radio frequency signal and at least inputting a switch, and outputting the at least one radio frequency signal to a first branch or a second branch through the input switch; the first branch and/or the second branch are/is used for amplifying one of the at least one radio frequency signal; and respectively outputting the amplified at least one radio frequency signal to at least one radio frequency antenna through an output switch.
Description
Technical Field
The present invention relates to the field of wireless communication technologies, and in particular, to a balanced amplifier and a power amplification method for a radio frequency signal.
Background
In a conventional radio frequency power amplifier, a balanced amplifier exists, which divides an input signal into two paths to be amplified respectively, and then an output end of the balanced amplifier realizes power synthesis. The structure can realize higher output power, and the balanced amplifier has the characteristics of insensitivity to output load and the like. In order to increase the uploading or downloading rate in wireless communication equipment, a Multiple Input Multiple Output (MIMO) scheme is currently adopted, and each path of transmitting and receiving path has a set of independent transmitting power amplifier, switch, filter and receiving low noise amplifier. The current 5G mobile terminal generally requires to support 2-way uplink transmission and 4-way download reception (2T4R), and the transmission power of the mobile terminal supporting 2-way uplink transmission requires a common transmission power, for example, the antenna port requires 23 dBm. Meanwhile, part of mobile terminals require 1 uplink transmission and 4 downlink reception (1T4R), at this time, the 1 uplink transmission power is required to support High Power (HPUE), the transmission power is 3dB higher than the single transmission power of 2T4R, and the antenna port is required to reach 26 dBm.
Disclosure of Invention
The invention aims to provide a balanced amplifier, which saves radio frequency paths and devices of MIMO and improves the transmitting power.
In one embodiment of the present application, there is provided a balanced amplifier including:
an input switch, wherein at least one radio frequency signal is coupled to the input switch;
a first and a second branch, said first and second branch being connected to said input switch respectively and being configured to amplify one of said at least one radio frequency signal respectively;
and the output switch is respectively connected with the first branch and the second branch and respectively outputs the amplified at least one radio frequency signal to at least one radio frequency antenna.
In a preferred embodiment, the first branch includes a first phase shift unit, a first power amplifier, and a second phase shift unit, which are connected in sequence.
In a preferred embodiment, the first phase shifting unit includes a first capacitor coupled between the input switch and a ground terminal and a first inductor coupled between the input switch and the first power amplifier, and the second phase shifting unit includes a second capacitor coupled between the first power amplifier and the output switch and a second inductor coupled between the output switch and the ground terminal.
In a preferred embodiment, the second branch includes a third phase shift unit, a second power amplifier, and a fourth phase shift unit, which are connected in sequence.
In a preferred embodiment, the third phase shifting unit includes a third inductor coupled between the input switch and a ground terminal and a third capacitor coupled between the input switch and the second power amplifier, and the fourth phase shifting unit includes a fourth inductor coupled between the second power amplifier and the output unit and a fourth capacitor coupled between the output unit and the ground terminal.
In a preferred embodiment, two rf signals are respectively coupled to the input switch, the first or second branch amplifies one of the rf signals, and the output switch outputs the amplified rf signal to an rf antenna.
In a preferred embodiment, two rf signals are respectively coupled to the input switches, the first and second branches respectively amplify one of the rf signals, and the output switches respectively output the amplified rf signals to the separate rf antennas.
Another embodiment of the present application provides a method for amplifying power of a radio frequency signal, including:
inputting at least one radio frequency signal and at least inputting a switch, and outputting the at least one radio frequency signal to a first branch or a second branch through the inputting switch;
the first branch and/or the second branch are/is used for amplifying one of the at least one radio frequency signal;
and respectively outputting the amplified at least one radio frequency signal to at least one radio frequency antenna through an output switch.
In a preferred embodiment, one of the at least one rf signal is input to the first branch at half power, and the first branch sequentially phase-shifts the rf signal by 45 °, amplifies the rf signal by n times, and phase-shifts the rf signal by-45 °.
In a preferred embodiment, one of the at least one rf signal is input to the second branch with half power, and the first branch sequentially phase-shifts the rf signal by-45 °, amplifies the rf signal by n times, and then phase-shifts the rf signal by 45 °.
Compared with the prior art, the method has the following beneficial effects:
in this application, a novel balanced amplifier supporting single antenna or dual antenna is proposed, which can realize low-cost schemes of 2T4R and 1T4R, and simultaneously, in combination with a low power transmission state, turning on part of branches of the amplifier can reduce the current and power consumption of the amplifier, and at the same time, the cost and volume of the radio frequency front-end sections 2T4R and 1T4R are significantly reduced.
The present specification describes a number of technical features distributed throughout the various technical aspects, and if all possible combinations of technical features (i.e. technical aspects) of the present specification are listed, the description is made excessively long. In order to avoid this problem, the respective technical features disclosed in the above summary of the invention of the present application, the respective technical features disclosed in the following embodiments and examples, and the respective technical features disclosed in the drawings may be freely combined with each other to constitute various new technical solutions (which should be regarded as having been described in the present specification) unless such a combination of the technical features is technically infeasible. For example, in one example, the feature a + B + C is disclosed, in another example, the feature a + B + D + E is disclosed, and the features C and D are equivalent technical means for the same purpose, and technically only one feature is used, but not simultaneously employed, and the feature E can be technically combined with the feature C, then the solution of a + B + C + D should not be considered as being described because the technology is not feasible, and the solution of a + B + C + E should be considered as being described.
Drawings
FIG. 1 is a block diagram of a balanced amplifier according to an embodiment of the invention.
Fig. 2 is a circuit schematic of a balanced amplifier with an rf signal input according to an embodiment of the invention.
Fig. 3 is a circuit schematic of a balanced amplifier with an rf signal input according to an embodiment of the invention.
Fig. 4 is a circuit schematic of a balanced amplifier with two rf signal inputs according to another embodiment of the present invention.
Fig. 5 is a circuit schematic of a balanced amplifier with two rf signal inputs according to another embodiment of the present invention.
Fig. 6 is a circuit schematic of a balanced amplifier with two rf signal inputs according to another embodiment of the present invention.
Fig. 7 is a flowchart of a method for amplifying power of an rf signal according to an embodiment of the invention.
Detailed Description
In the following description, numerous technical details are set forth in order to provide a better understanding of the present application. However, it will be understood by those skilled in the art that the technical solutions claimed in the present application can be implemented without these technical details and with various changes and modifications based on the following embodiments.
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Example one
In the present embodiment, there is provided a balanced amplifier, a block diagram of which is shown with reference to fig. 1, the balanced amplifier including:
an input switch 101, wherein at least one radio frequency signal RFin is coupled to said input switch 101;
a first and a second branch 102, 103, said first and second branch 102, 103 being respectively connected to said input switch 101 and respectively configured to amplify one of said at least one radiofrequency signal RFin;
and an output switch 105, wherein the output switch 104 is respectively connected to the first and second branches 102 and 103, and respectively outputs the amplified at least one rf signal RFin to at least one rf antenna ANT.
In a preferred embodiment, the circuit diagram of the balanced amplifier is shown with reference to fig. 2, and the balanced amplifier includes an input switch 211, first and second branches, and an output switch 212. Wherein the first branch comprises a first phase shift unit, a first power amplifier 203 and a second phase shift unit which are connected in sequence. In a preferred embodiment, the first phase shifting unit comprises a first capacitor 201 coupled between the input switch 211 and the ground terminal and a first inductor 202 coupled between the input switch 211 and the first power amplifier 203, and the second phase shifting unit comprises a second capacitor 204 coupled between the first power amplifier 203 and the output switch 212 and a second inductor 205 coupled between the output switch 212 and the ground terminal.
In a preferred embodiment, the second branch includes a third phase shift unit, a second power amplifier 208 and a fourth phase shift unit connected in sequence. In a preferred embodiment, the third phase shifting unit includes a third inductor 206 coupled between the input switch 211 and the ground terminal and a third capacitor 207 coupled between the input switch 211 and the second power amplifier 208, and the fourth phase shifting unit includes a fourth inductor 209 coupled between the second power amplifier 208 and the output unit 212 and a fourth capacitor 210 coupled between the output unit 212 and the ground terminal.
After an input rf signal RFin passes through the input switch 211, half of the signal (half of the power) passes through the first capacitor 201 coupled in parallel to ground and the first inductor 202 coupled in series, forming a 45 ° phase shift to the input of the first power amplifier 203, the first power amplifier 203 amplifies the signal by n times, and passes through the second capacitor 204 coupled in series with the output matching network and the second inductor 205 coupled in parallel to ground, forming a-45 ° phase shift. The other half of the signal (half of the power) passes through a third capacitor 206 in parallel to ground and a third inductor 207 in series forming a-45 ° phase shift to the input of a second power amplifier 208, which second power amplifier 208 amplifies the signal by a factor of n, through a fourth inductor 209 in series with an output matching network and a fourth capacitor 210 in parallel to ground forming a 45 ° phase shift. The two signals are subjected to equal-amplitude and same-phase power synthesis at an output port through a power synthesis switch 212, and are output to an antenna ANT through an output switch, so that high-power output of HPUE is realized. Input or output matching phase shifting networks 201 and 202, 204 and 205, 206 and 207, 209 and 210 shown in fig. 2 are all one-stage matching networks, and may be formed of multiple stages of matching networks or other phase shifting devices.
Example two
The balanced amplifier of this embodiment is substantially the same as the balanced amplifier of the first embodiment, except that: referring to fig. 3, an input rf signal RFin is input to an input switch 311 with half power, the half power rf signal RFin passes through a first capacitor 301 connected in parallel to the ground and a first inductor 302 connected in series to form a 45 ° phase shift to an input terminal of a first power amplifier 303, the first power amplifier 303 amplifies the signal by n times, passes through a second capacitor 304 connected in series to an output matching network and a second inductor 305 connected in parallel to the ground to form a-45 ° phase shift to an output switch 312, and is output to an antenna ANT through the output switch. In the embodiment, the working current of the amplifier can be reduced and the power consumption can be reduced under the condition that HPUE high-power output is not needed. It should be understood by those skilled in the art that in this embodiment, the radio frequency signal may also be switched to pass through the second branch circuit for amplification through the input switch 311 and the output switch 312, so that the same technical effect may be achieved, and details are not described herein.
EXAMPLE III
The balanced amplifier of this embodiment is substantially the same as the balanced amplifier of the first embodiment, except that: the two radio frequency signals are respectively coupled to the input switch, the first branch or the second branch amplifies one of the radio frequency signals, and the output switch outputs the amplified radio frequency signal to a radio frequency antenna.
Specifically, referring to fig. 4, in this embodiment, there are two rf signals RFinA, RFinB input, after the rf signal RFinA passes through the input switch 411, RFinA passes through the first capacitor 401 connected in parallel to ground and the first inductor 402 connected in series with half power to form a 45 ° phase shift to reach the input of the first power amplifier 403, the first power amplifier 403 amplifies the signal by n times, and the second capacitor 404 connected in series with the output matching network and the second inductor 405 connected in parallel to ground form a-45 ° phase shift. The other half of the rf signal RFinA passes through a third capacitor 406 coupled in parallel to ground and a third inductor 407 coupled in series to form a-45 ° phase shift to the input of a second power amplifier 408. the second power amplifier 408 amplifies the signal by a factor of n, passing through a fourth inductor 409 coupled in series to the output matching network and a fourth capacitor 410 coupled in parallel to ground to form a-45 ° phase shift. The two signals are subjected to power synthesis by the output switch 412 at the output port, so that equal-amplitude and same-phase power synthesis is realized, and the signals are output to the second antenna ANT2, so that high-power output of the HPUE is realized.
Example four
The balanced amplifier of this embodiment is substantially the same as the balanced amplifier of the first embodiment, except that: the two radio frequency signals are respectively coupled to the input switch, the first branch or the second branch amplifies one of the radio frequency signals, and the output switch outputs the amplified radio frequency signal to a radio frequency antenna.
Specifically, referring to fig. 5, in this embodiment, there are two rf signals RFinA, RFinB input, after the rf signal RFinB passes through the input switch 511, RFinB passes through the first capacitor 501 connected in parallel to ground and the first inductor 502 connected in series with half power to form a 45 ° phase shift to reach the input end of the first power amplifier 503, the first power amplifier 503 amplifies the signal by n times, and the signal passes through the second capacitor 504 connected in series with the output matching network and the second inductor 505 connected in parallel to ground to form a-45 ° phase shift. The other half of the rf signal RFinB passes through a third capacitor 506 in parallel to ground and a third inductor 507 in series forming a-45 ° phase shift to the input of a second power amplifier 508. the second power amplifier 508 amplifies the signal by a factor of n, passing through a fourth inductor 509 in series with an output matching network and a fourth capacitor 510 in parallel to ground forming a-45 ° phase shift. The two signals are subjected to power synthesis by the output switch 512 at the output port, so that equal-amplitude and same-phase power synthesis is realized, and the signals are output to the first antenna ANT1, so that high-power output of the HPUE is realized.
The fourth embodiment and the fifth embodiment can realize single-ended output of signals, and only part of branches of the balanced amplifier are opened, so that the current and the power consumption of the amplifier are reduced.
EXAMPLE five
The balanced amplifier of this embodiment is substantially the same as the balanced amplifiers of the fourth and fifth embodiments, except that: the two radio frequency signals are respectively coupled to the input switches, the first branch circuit and the second branch circuit respectively amplify one of the radio frequency signals, and the output switches respectively output the amplified radio frequency signals to the independent radio frequency antennas.
Specifically, referring to fig. 6, in the present embodiment, the input rf signals RFinA and RFinB are provided, the rf signal RFinA is input to the input switch 611 with half power, passes through the first capacitor 601 connected in parallel to the ground and the first inductor 602 connected in series to form a 45 ° phase shift to reach the input end of the first power amplifier 603, the first power amplifier 603 amplifies the signal by n times, passes through the second capacitor 604 connected in series to the output matching network and the second inductor 605 connected in parallel to the ground to form a-45 ° phase shift, and is output to the first antenna ANT1 after passing through the output switch 612. After the rf signal RFinA is input to the input switch 611 with half power, it passes through the third capacitor 606 coupled in parallel to ground and the third inductor 607 coupled in series to form a-45 ° phase shift to the input of the second power amplifier 608, which amplifies the signal n times, passes through the fourth inductor 609 coupled in series to the output matching network and the fourth capacitor 610 coupled in parallel to ground to form a-45 ° phase shift, and is output to the second antenna ANT2 after passing through the output switch 612. In this embodiment, when the HPUE does not need high power, 2-channel simultaneous transmission is realized.
The embodiment provides a novel balanced amplifier supporting dual antennas, and the balanced amplifier can realize a scheme of 2T4R with low cost, and significantly reduces the cost and volume of the radio frequency front-end 2T 4R.
EXAMPLE six
In this embodiment, a power amplification method for a radio frequency signal is provided, and fig. 7 is a flowchart of the power amplification method for a red radio frequency signal in this embodiment, where the method includes:
step S101, inputting at least one radio frequency signal at least to an input switch, and outputting the at least one radio frequency signal to a first branch or a second branch through the input switch;
step S102, the first and/or second branch is/are respectively used for amplifying one of the at least one radio frequency signal;
and step S103, respectively outputting the amplified at least one radio frequency signal to at least one radio frequency antenna through an output switch.
In a preferred embodiment, one of the at least one rf signal is input to the first branch at half power, and the first branch sequentially phase-shifts the rf signal by 45 °, amplifies the rf signal by n times, and phase-shifts the rf signal by-45 °.
In a preferred embodiment, one of the at least one rf signal is input to the second branch with half power, and the first branch sequentially phase-shifts the rf signal by-45 °, amplifies the rf signal by n times, and then phase-shifts the rf signal by 45 °.
It is noted that, in the present patent application, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the use of the verb "comprise a" to define an element does not exclude the presence of another, same element in a process, method, article, or apparatus that comprises the element. In the present patent application, if it is mentioned that a certain action is executed according to a certain element, it means that the action is executed according to at least the element, and two cases are included: performing the action based only on the element, and performing the action based on the element and other elements. The expression of a plurality of, a plurality of and the like includes 2, 2 and more than 2, more than 2 and more than 2.
All documents mentioned in this specification are to be considered as being incorporated in their entirety into the disclosure of the present application so as to be subject to modification as necessary. It should be understood that the above description is only a preferred embodiment of the present disclosure, and is not intended to limit the scope of the present disclosure. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of one or more embodiments of the present disclosure should be included in the scope of protection of one or more embodiments of the present disclosure.
In some cases, the actions or steps recited in the claims may be performed in a different order than in the embodiments and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing may also be possible or may be advantageous.
Claims (10)
1. A balanced amplifier, comprising:
an input switch, wherein at least one radio frequency signal is coupled to the input switch;
a first and a second branch, said first and second branch being connected to said input switch respectively and being configured to amplify one of said at least one radio frequency signal respectively;
and the output switch is respectively connected with the first branch and the second branch and respectively outputs the amplified at least one radio frequency signal to at least one radio frequency antenna.
2. The balanced amplifier of claim 1, wherein the first branch comprises a first phase shift unit, a first power amplifier, and a second phase shift unit connected in sequence.
3. The balanced amplifier of claim 2, wherein the first phase shifting unit comprises a first capacitor coupled between the input switch and ground and a first inductor coupled between the input switch and the first power amplifier, and the second phase shifting unit comprises a second capacitor coupled between the first power amplifier and the output switch and a second inductor coupled between the output switch and ground.
4. The balanced amplifier of claim 1, wherein the second branch comprises a third phase shifting unit, a second power amplifier and a fourth phase shifting unit connected in sequence.
5. The balanced amplifier of claim 4, wherein the third phase shifting unit includes a third inductor coupled between the input switch and ground and a third capacitor coupled between the input switch and the second power amplifier, and the fourth phase shifting unit includes a fourth inductor coupled between the second power amplifier and the output unit and a fourth capacitor coupled between the output unit and ground.
6. The balanced amplifier of claim 1, wherein two rf signals are respectively coupled to the input switches, one of the rf signals is amplified by the first or second branch, and the output switch outputs the amplified rf signal to an rf antenna.
7. The balanced amplifier of claim 1, wherein two rf signals are respectively coupled to the input switches, the first and second branches respectively amplify one of the rf signals, and the output switches respectively output the amplified rf signals to separate rf antennas.
8. A method of power amplification of a radio frequency signal, comprising:
inputting at least one radio frequency signal and at least inputting a switch, and outputting the at least one radio frequency signal to a first branch or a second branch through the inputting switch;
the first branch and/or the second branch are/is used for amplifying one of the at least one radio frequency signal;
and respectively outputting the amplified at least one radio frequency signal to at least one radio frequency antenna through an output switch.
9. The method for power amplifying a radio frequency signal according to claim 8, wherein one of the at least one radio frequency signal is inputted to the first branch with half power, and the first branch sequentially phase-shifts the radio frequency signal by 45 °, amplifies the radio frequency signal by n times, and phase-shifts the radio frequency signal by-45 °.
10. The method for power amplifying a radio frequency signal according to claim 8, wherein one of the at least one radio frequency signal is inputted to the second branch with half power, and the first branch sequentially phase-shifts the radio frequency signal by-45 °, amplifies the radio frequency signal by n times, and phase-shifts the radio frequency signal by 45 °.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010147238.2A CN111293996A (en) | 2020-03-05 | 2020-03-05 | Balanced amplifier and power amplification method of radio frequency signal |
| PCT/CN2020/078631 WO2021174565A1 (en) | 2020-03-05 | 2020-03-10 | Balanced amplifier, and power amplification method for radio-frequency signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010147238.2A CN111293996A (en) | 2020-03-05 | 2020-03-05 | Balanced amplifier and power amplification method of radio frequency signal |
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| CN111293996A true CN111293996A (en) | 2020-06-16 |
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| CN202010147238.2A Pending CN111293996A (en) | 2020-03-05 | 2020-03-05 | Balanced amplifier and power amplification method of radio frequency signal |
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| WO (1) | WO2021174565A1 (en) |
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| CN112910492A (en) * | 2021-01-29 | 2021-06-04 | Oppo广东移动通信有限公司 | Radio frequency PA Mid device, radio frequency system and communication equipment |
| CN114640367A (en) * | 2020-12-01 | 2022-06-17 | Oppo广东移动通信有限公司 | Radio frequency device, radio frequency front end circuit, radio frequency system and communication equipment |
| CN116366059A (en) * | 2023-04-10 | 2023-06-30 | 东西分析(永清)仪器有限公司 | Radio frequency power synthesis circuit and method |
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|---|---|
| WO2021174565A1 (en) | 2021-09-10 |
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Application publication date: 20200616 |